A. 1s² 2s² 2p5
B. 1s² 2s² 3s² 3p³
C. 1s² 2s² 2p³ 3s²
D. 1s² 2s² 2p6 3s² 3p6 4s¹
Correct Answer:
Option A – 1s² 2s² 2p5
What is the electronic configuration of an element represented as 19 9X?
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